title: Ossification of the sesamoid bone at the base of the first finger in Czech boys and girls.
abstract: Ossification of the sesamoid bone of the first finger was studied in left hand-and-wrist X-rays of 296 Czech boys and 272 girls 9 to 15 years old using data collected between 1962 and 1966. The logit and the YES or NO methods were used in treating the data. A sesamoid bone, clearly visible to the naked eye, was considered as positive and when it was not yet visible, as negative. The sesamoid bone was developed in 50 per cent of boys at the age of 13.6 years and in 50 per cent of girls at the age of 11.2 years. This stage preceded the age at onset of menarche in Czech girls by 1.9 years. Boys showed a greater variability (SD = 1.4) than girls (SD = 0.8). Both sexes with clearly visible (ossified) sesamoid bones in their first fingers showed to be, on the average, taller and heavier in comparison with the Czech standard and with those boys and girls of corresponding ages without the sesamoid bone. In contrast to the still continuing secular trend in stature in Czech youths, the age of menarche remained in the last cca 30 years unchanged. In view of the close link between bone age and onset of menarche which remained unchanged for the past 30 years, we may consider our finding as still applicable to present-day adolescents.
authors.affiliation: National Institute of Public Health, Prague, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Prokopec
authors.forename: K
authors.initials: K
authors.lastname: Pfeiferová
authors.forename: M
authors.initials: M
authors.lastname: Josífko
mesh_terms: D000293:Adolescent; D000365:Age Determination by Skeleton; D000367:Age Factors; D001827:Body Height; D001835:Body Weight; D002648:Child; D018153:Czech Republic; D005260:Female; D005385:Fingers; D006128:Growth; D006801:Humans; D016015:Logistic Models; D008297:Male; D010012:Osteogenesis / Q000502:physiology*; D011627:Puberty; D012016:Reference Values; D012716:Sesamoid Bones / Q000000981:diagnostic imaging* / Q000502:physiology*; D012727:Sex Characteristics